1. First we need to enter the Fallout Shelter game, and then we click on the room pointed by the arrow in the picture.
2. In the pop-up information bar, we click the Rebuild button. After a moment, we will enter the room reconstruction interface.
3. Select the room we need to transfer and remodel, then click Dismantle. After selecting the empty location we want to remodel, save the new house layout and exit the reconstruction interface to complete the rearrangement operation.